Study On Wear Behavior And Wear Prediction Method Of Rolling Cutter Ring(H13Steel)

Considering the urgent requirement of shield machine to reduce the wear of rolling cutter, research on the friction and wear properties of cutter ring was performed on this paper. Based on the investigation of shield construction site, the main failure mode and failure mechanism were studied. The effects of impact angle, impact velocity and patricle size on the wear behavior as well as residual stress of rolling cutter ring(H13steel) were studied by means of non-linear software Abaqus. A model to predict the wear of rolling cutter ring was established by combining Archard wear model and Abaqus, with the help of which the rock breaking process was simulated. Main conclusions were presented as followed:1、The most important failure form of H13rolling cutter in the construction of2226section of Shenzhen metro line2was normal wear, which accounted for85percent of the total number of failure cutter.8percent of rolling cutter became invalid for reason of partial grinding and4percent for fracture. The fracture mechanism of cutter ring was brittle breaking, caused by band structure and non-uniform distributed VC primary carbide with diameter of5～20μm.2、When2rigid particles(500μm) impact H13steel with the same velocity, single wear ratio and the erosion speed meet the exponential relationship, in which the value of exponent turn out to be2.46for the first erosion and2.68for the second. For single particle erosion, the erosion ratio decrease after rising first along with the increase of erosion angle. When a particle with diameter of500μm impact H13steel with velocity of75m/s. The maximum erosion ratio of H13steels by a single particle is0.85mm3/g, when the impacting angle is60°3、Surface residual stress of H13steel after erosion by granite particle was turned out to be compression stress, whose value increased at first and then decreased along the direction vertical to erosion surface. When a particle with diameter of300μm impact H13steel with velocity of75m/s, the residual stress of H13steels change from compressive stress to tensile stress at a distance of223μm away from the surface if the erosion angle is60°, and the maximum compressive stress is689MPa, which turn out to be64μm away from surface.4、Combined with finite element method and the Archard wear calculation formula, a method to predict wear of rolling cutter ring was proposed. The predicting results of the fastest wear part in NO.25cutter ring when working on moderately weathered granite, slightly weathered granite, tuffaceous siltstone is2.681×10-4mm/r,4.461X10-4mm/r,1.214×10-4mm/r respectively, which are in good agreement with the experimental results and statistical results on spot.